Audio Joiner

What Audio Joiner does

Audio Joiner places several audio files end to end and saves them as one track. Use it for parts, takes, or chapters that belong together.

Tracks are joined in the order shown in the queue, from top to bottom. No gap, fade, or crossfade is added between them, and the combined audio is re-encoded into the output format you pick.

How to use it

1. Select Add files and choose two or more recordings. You can add more later.
2. Each new batch is sorted by file name, with numbers in natural order so track2 comes before track10, and placed below anything already queued.
3. Select a file in the list to hear it in the player under the queue. Use Up and Down to move it, Remove to drop it, or Clear to start over.
4. Pick an Output format in the Join panel, then select Join.
5. Listen to the result under Combined Output, then select Download to keep it.

Formats and limits

• The queue accepts MP3, WAV, M4A, AAC, FLAC, OGG, OPUS, WMA, AIF, AIFF, ALAC, and AC3 files. Anything else is skipped, and adding the exact same file twice does nothing.
• The joined track can be MP3, WAV, AAC, M4A, FLAC, OGG, OPUS, AC3, or AIFF. It is named after the top file with -combined added.
• Channel count, sample rate, and bitrate are copied from the top file, so list first the recording whose settings the output should follow. Where the output format cannot use a setting, the closest one it supports is used. Opus is always 48 kHz and at most stereo, and bitrates stay within what each format allows, such as 320 kbps for MP3.
• The files are read as one continuous stream, which makes a join most reliable when every part shares the same format, sample rate, and channel count.
• Tags like title and artist, and any cover art, are left out of the combined file.

Settings explained

Output format

Sets the file type of the joined track. Changing it, or changing the queue, throws away the last result, so select Join again afterward.

Advanced logs

Adds the engine messages and progress in steps of ten percent to the Status log, which helps when a join fails.

Privacy

Every track you add stays on your device. When the page opens, Audio Joiner loads its FFmpeg processing engine from the jsDelivr CDN, or from this site if the CDN cannot be reached, copies your recordings into that engine inside the tab, and hands the merged file back without sending any audio to a server.

FAQ

Can I join an MP3 with a WAV or other mixed formats?

The queue takes them, but because the parts are chained as one stream, mixed formats can fail or play back wrong. Run the odd file through Audio Converter so every part matches, then join them.

Why is the Join button unavailable?

It needs at least two files in the queue, and it switches off while a join is already running.

How do I choose which track plays first?

Select that file in the list and press Up until it reaches the top. The top file opens the output and also gives it its name.

Is silence added between the tracks?

No. Each track begins where the one above it ends. To cut dead air from the edge of a file, trim it in Audio Cutter before adding it.

Related tools

• Audio Cutter - shorten a recording to the part you need before adding it to the queue.
• Audio Converter - make mismatched files match before a join, or convert them separately.
• Audio Fade In and Out - smooth the start and end of the joined track.
• Volume Changer and Normalizer - even out the level of the joined track.
• Video Joiner - join video clips end to end instead.